The difference between simple binary compounds and complexes is discussed in the context of charge-transfer (electron-transfer) absorption spectroscopy and correlations involving the optical electronegativities χ* and χopt. Using existing data, mainly for binary chlorides and bromides, values of χ* are obtained for Cr3+, Mn2+, Fe2+, Co2+, and Ni2+, and applied to binary sulphides and doped zinc sulphide crystals.
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Journal of the Chemical Society, Dalton Transactions
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